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Hc And Co Values Very High From Mot Emission Test

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#1 starfield

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Posted 28 March 2013 - 11:56 AM

Hi All,

 

I have just returned from the MOT test centre and my ford focus passed the test. However when I looked closely at the emission test result, I was somewhat shocked. It almost failed and the emission deteriorated during the course of the year. The table below shows the emission over the last few years

 

 

Age                Year              CO                       HC                   Lambda             Natural Idle Test / CO

3                     2010              0                         7                       1.01                              0.01

4                     2011            0.01                      1                          1                                0.01

5                     2012            0.01                     10                         1                                0.01

6                     2013            0.198                   165                   0.985                             0.231

 

The emission got a lot worse from 2012 to 2013.

Does anybody know what could cause that?



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#2 james_60

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Posted 28 March 2013 - 12:04 PM

Hi

 

Coked up oxygen sensors etc

Cooked Catalytic converter

Clogged Injectors

Blocked Air Filter

 

It could be any of those above,

 

Was the car serviced before the mot,

 

Do you take the car for a blast before the mot

 

Jamie



#3 Stoney871

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Posted 29 March 2013 - 07:00 AM

Sounds like general gumming up due to normal wear and tear.

Have you thought of giving the car a Terraclean service?

It was used on Wheeler dealers and took an MOT emissions failure back to nearly zero emissions.

It's being rolled out around the country now and Edd China is even endorsing it on TV (planning to give it a go on my car soon).

 

http://www.terraclean.co.uk/

 

(i'm not affiliated with the company or anything like that, I just believe it sounds like a great idea and will save a lot of people the fear of failing the emissions section of their M.O.T)



#4 wase16ll

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Posted 29 March 2013 - 01:32 PM

any idea how warm engine was when tested, if it wasnt up to operating temperature i wouldnt be concerned with the figures.
otherwise..
if not had recent service, give it a once over, even old oil would be enough to effect emissions...would need to renew oil/filters/plugs anyway before trying to find any further fault

#5 starfield

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Posted 30 March 2013 - 02:37 PM

The car had an oil and oil filter change two weeks prior to Mot test

I did not take the car out for a blast before mot as suggested by James_60

The test was done last Thursday at 0800 and the outside temperature was reading -1.

#6 starfield

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Posted 30 March 2013 - 02:37 PM

any idea how warm engine was when tested, if it wasnt up to operating temperature i wouldnt be concerned with the figures.otherwise..if not had recent service, give it a once over, even old oil would be enough to effect emissions...would need to renew oil/filters/plugs anyway before trying to find any further fault


Outside temperature was -1

#7 wase16ll

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Posted 30 March 2013 - 07:39 PM

outside temp wont have any significant effect on emissions beyond time it takes for engine to reach operating temp.
put another way, engine oil needs to be around 70/80 degs before you can accurately measure exhaust gasses, in order for oil to reach that temp, thermostat needs to be fully open, probably to the point cooling fan cuts in.
its perfectly ok to carry out a test on a cold/warm engine, as exhaust gasses may still pass the emmission test...
if they had failed then next stage would have been to measure the oil temperature untill it reached the recommended min temp for that engine,once reached then gasses are measured again.

so the figures quoted on your car test may have been measured on a relatively cold engine, no further measurements needed as they passed.
only way of knowing if you have a pending problem is either ask if your engine was hot at time of test, or run it up to temperature and get gasses measured again..

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